US Patent No. 9,426,826

CONTENTION RESOLUTION FOR AN ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING WIRELESS ACCESS NODE


Patent No. 9,426,826
Issue Date August 23, 2016
Title Contention Resolution For An Orthogonal Frequency-division Multiplexing Wireless Access Node
Inventorship Siddharth Oroskar, Overland Park, KS (US)
Maulik K. Shah, Austin, TX (US)
Jasinder Pal Singh, Olathe, KS (US)
Nitesh Manchanda, Overland Park, KS (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,426,826

1. A method of operating an orthogonal frequency-division multiplexing (OFDM) wireless access node to facilitate contention
resolution between wireless communication devices, the method comprising:
receiving connection requests on a random access channel transmitted from a first wireless communication device and a second
wireless communication device;

transmitting a resource allocation message comprising a same resource block to both the first wireless communication device
and the second wireless communication device;

receiving competing connection request messages transmitted from the first wireless communication device and the second wireless
communication device on the same resource block and selecting the first wireless communication device for connection setup;
and

responsive to selecting the first wireless communication device for connection setup, generating a contention resolution message
comprising a contention resolution identifier associated with the first wireless communication device, transferring the contention
resolution message for delivery to the first wireless communication device and the second wireless communication device, and
paging the second wireless communication device with a contention-free preamble, wherein the first wireless communication
device is configured to determine that the contention resolution identifier received in the contention resolution message
is associated with the first wireless communication device and to responsively decode connection setup information, and

wherein the second wireless communication device is configured to monitor a channel for the contention-free preamble and utilize
the contention-free preamble to request a connection.